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Correct Answer: C) Agnatha-Branchiostoma.
Correct Answer: C) Perpetual change.
Correct Answer: B) "Sponges".
Correct Answer: A) Monograph.
Correct Answer: B) Crocodilia.
Correct Answer: D) D all the above.
Correct Answer: C) Class Chondrichthyes.
Correct Answer: A) Notacord.
Correct Answer: D) Choanocytes.
Correct Answer: C) Internal Fertilization.
Correct Answer: A) Mesoderm.
Correct Answer: A) Star fish.
Correct Answer: B) Metamorphosis.
Correct Answer: B) Placental.
Correct Answer: C) Corals.
Correct Answer: A) Water vascular system.
Correct Answer: D) Annelida.
Correct Answer: D) Animalia.
Correct Answer: B) Liver-fluke.
Correct Answer: B) Bilateral.
Correct Answer: A) Amphibians.
Correct Answer: B) Platyhelminthes.
Correct Answer: D) Limnology.
Correct Answer: A) Identical arrangement of organs in all the segments.
Correct Answer: B) Hydra.